for people ages 18 years and up (full criteria)
at San Diego, California and other locations
study started
estimated completion
Principal Investigator
by Michael Choi, MD
Photo of Michael Choi
Michael Choi



This study evaluates the immune response to severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2) vaccines in patients with chronic lymphocytic leukemia (CLL) or small lymphocytic lymphoma (SLL). CLL and SLL are types of blood cancer that begin in cells of the immune system. CLL/SLL and the medications used to treat these conditions may change the way vaccines work in a patient's body. The purpose of this study is to find out if patients with CLL/SLL make antibodies, or have an immune response, to the SARS-CoV-2 vaccines. Information gained from this study may help researchers better understand how effective the vaccines work in preventing COVID-19 (coronavirus disease 2019) in patients with CLL and SLL.

Official Title

Multicenter Evaluation of SARS-CoV-2 Vaccines in Patients With CLL/SLL


OUTLINE: For patients who have not been vaccinated at the time of enrollment, they will undergo collection of blood samples prior to the first vaccine dose, just before the second vaccine dose, and then at 1, 6, and 12 months after the second vaccine dose. Patients' medical records are also reviewed. For patients enrolled after vaccination, they will undergo collection of blood samples at 1-4, 6, and 12 months after completing the vaccination series. After completion of study, patients are followed up every 6 months for 2 years.


Chronic Lymphocytic Leukemia Small Lymphocytic Lymphoma Lymphoma Leukemia Leukemia, Lymphoid Leukemia, Lymphocytic, Chronic, B-Cell Biospecimen Collection Electronic Health Record Review


You can join if…

Open to people ages 18 years and up

  • Age >= 18 years
  • A diagnosis of chronic lymphocytic leukemia (CLL) or small lymphocytic lymphoma (SLL)

You CAN'T join if...

  • Any known history of prior SARS-CoV-2/COVID19 infection


  • University of California San Diego not yet accepting patients
    San Diego California 92103 United States
  • UC Irvine Health/Chao Family Comprehensive Cancer Center accepting new patients
    Orange California 92868 United States

Lead Scientist at UCSD

  • Michael Choi, MD
    Associate Clinical Professor, Medicine. Authored (or co-authored) 21 research publications.


accepting new patients
Start Date
Completion Date
University of Washington
Study Type
Last Updated